JBIDE-18848 setup ide-config.properties test (experiment)

This code final resting place is probably *not* inside tests module, but I put it there to just get easily started
and be able to show the code running easily.

This additional test simply iterates all properties in ide-config.properties to do some basic validation.
If you're testing /core/4.1.kepler/ should you also test core/4.2.luna/ and future 4.3.mars?